I already read a lot of posts in the forum and didn't actually found something alike the results i got, so I would love a little help!

couple days ago, I did a repartition using Gparted on a Live Cd with ubuntu on the main HDD of my computer (runing w10 btw). I was intended to divide mi main HDD space in half (more or less), because the owner wanted a donwgrade to w7, and this needed a clean install (after backup, as well). Defrag from w10, check for errors, everything ok, then modify and done!

The operation went succesful, and then i rebooted into windows 10 without any problem, and scatered around my files. The problem was that w10 didn't show the new unit D, but still showed the unit C at full size, without the repartitioning (???). Restarted twice, and didn't seem to be a change, which was worrying, but working.

Then i left the computer uploading files to the backup on OneDrive (decided i will backup on cloud, altought the looong time for this). Next morning i woke up to find the bluescreen and the message of "NTFS_FILE_SYSTEM". It was looped rebooting; tried chkdsk /f from a recovery unit, and didn't do anything, rebooting again.

opened from live CD, and couldn't mount my drives! so I tried Testdisk, quick check and deep check, and found this:

I simply don't get it... If the SO was able to open and run, and I was able to access my files, why i cannot anymore? how can i fix it?

this is my mom's computer, and she has a lot of works (embroidery files). Can someone help me out? if i need to do something, just tell me and will upload anything you need to help me!

Did TestDisk find after "Deeper Search" more partitions?
Did you have a try to list your files on each partition?
After RebuildBS did you try to list your files?
Atl least the extrapolated and the current boot sector are different.

A safe solution would be datarecovery software.
You can have a look to PhotoRec.http://www.cgsecurity.org/wiki/PhotoRechttp://www.cgsecurity.org/wiki/PhotoRec_Step_By_Step
You can avoid to recover unnecessary file types by using the menu FileOpt and presseing s (select) will deselct all file types.
So you can select only these file types manually, which you want to recover.
PhotoRec doesn't recovery file names and directories.
If you'd like to recover file names and directories, you'll need commercial datarecovery software.
But it'd be depend on, that directories are not already damaged.
After datarecovery, you can consider to run chkdsk driveletter: /r to have a try to repair your file system.